Ludum Dare 24 (Evolution): Evoquarium

Requires Java 6 or greater and Java applets enabled

Controls

Move: Arrow keys or WASD

Shoot: Space

About

The point is to try and survive as long as possible by killing enemies and picking up "evos", which will evolve your size, shape, weapon, and colors.
Some attributes will affect other parts of your character, such as increasing size increases health and decreasing shape complexity (number of sides) increases speed.